Its easy to add or remove libraries from the Anaconda prompt. Once you have an the preferred environment activated, the simple Conda install command will search the Anaconda cloud repo for a matching package, and will begin download if it exists. Conda will warn if there are version dependencies with your other libraries. Always pay attention to these warnings, so that you know if any other library versions are affected. If, at any time, you need a reminder of what is in your environment, use the Conda list command to check package names and versions.

Let's look at some example commands:

1. Create a new environment called my_env with Python version 3 using the following command:

(base) $ Conda create -n my_env Python=3

2. Check whether my_env was created successfully by using the following command:

(base) $ Conda info --envs

You will see the following screen on the execution of the preceding command:

3. Activate a new environment by using the following command:

(base) $ Conda activate my_env

4. Install the numpy math library by using the following command:

(my_env) $ Conda install numpy

5. Use Conda list as follows, to check whether a new library was installed or not and all other libraries and versions in my_env:

(my_env) $ Conda list 

You will see the following screen on the execution of the preceding command:

If you choose to manage a smaller environment than the full bundle from Anaconda, I recommend the following essential libraries for data mining. They will be used throughout this book:

• numpy: The fundamental math library for Python. Brings with it the numpy array data structure.
• scipy: Provides science and engineering routines built on the base of the numpy array. This library also has some good statistical functions.
• pandas: Offers relational data tables for storing, labeling, viewing, and manipulating data. You will never look at an array of numbers in the same way for the rest of your career after you've gotten comfortable with pandas and its popular data structure, called a dataframe.
• matplotlib: Python's core visualization library with line and scatter plots, bar and pie charts, histograms and spectrograms, and so on.
• seaborn: As statistical visualization library. Built on top of matplotlib and much easier to use. You can build complicated visual representations with, in many cases, a single line of code. This library takes pandas dataframes as input.
• statsmodels: Library focused on statistics functions and statistical testing. For example, it has a .summary() function that returns helpful summary stats and information about a model you've applied.
• scikit-learn: Python's workhorse machine learning library. It is easy to use and is maintained by an army of developers. The best part is the documentation on http:\\scikit-learn.org . It is so extensive that one could learn the field of machine learning just by reading though the entirety of it.